/// <summary>
/// Tries the parse.
/// </summary>
/// <param name="formula">The formula.</param>
/// <param name="evaluator">The evaluator.</param>
/// <returns></returns>
public bool TryParse(string formula, out Func <MediaFile, string> evaluator)
{
CounterEval rz = new CounterEval()
{
_fmt = "d"
};
rz._error = null;
evaluator = rz.GetError;
StrParser prs = new StrParser();
char ch;
try {
prs.SetSource(formula.ToUpper());
if (!prs.ReadChar(out ch) || (ch != 'C'))
{
rz._error = string.Format("Error in formaula \"{0}\": must start from 'C'", formula);
return(false);
}
if (prs.IsEol)
{
rz._start = 0;
evaluator = rz.GetCounter;
return(true);
}
ch = prs.NextChar;
if (Char.IsDigit(ch)) // C10
{
if (!prs.ReadInt(out rz._start))
{
rz._error = string.Format("Error in formaula \"{0}\": cannot parse integer after 'C'", formula);
return(false);
}
if (prs.IsEol)
{
evaluator = rz.GetCounter;
return(true);
}
ch = prs.NextChar;
}
if (ch == 'F') // CF000 format
{
prs.Advance();
rz._fmt = prs.ReadToEnd();
if (string.IsNullOrWhiteSpace(rz._fmt))
{
rz._error = string.Format("Error in formaula \"{0}\": format must be integer after 'CF'", formula);
return(false);
}
else
{
evaluator = rz.GetCounter;
return(true);
}
}
rz._error = string.Format("Error in formaula \"{0}\". Must be in form: 'C'|'Cnn'|'CnnFfmt'|'CFfmt' where 'nn' is integer and fmt is integer format, e.g. 000", formula);
return(false);
}
catch (Exception x) {
rz._error = string.Format("Error in formaula \"{0}\". {1}: {2}", formula, x.GetType().Name, x.Message);
return(false);
}
}
/// <summary>
/// Tries the parse.
/// </summary>
/// <param name="formula">The formula.</param>
/// <param name="evaluator">The evaluator.</param>
/// <returns></returns>
public bool TryParse(string formula, out Func <MediaFile, string> evaluator)
{
SubNameEval rz = new SubNameEval();
rz._error = null;
evaluator = rz.GetError;
StrParser prs = new StrParser();
char ch;
try {
prs.SetSource(formula.ToUpper());
if (!prs.ReadChar(out ch) || (ch != 'N'))
{
rz._error = string.Format("Error in formaula \"{0}\": must start from 'N'", formula);
return(false);
}
if (prs.IsEol)
{
evaluator = rz.GetOriginalName;
return(true);
}
ch = prs.NextChar;
if ((ch == 'L') || (ch == 'R')) // NL10 or NR10 format
{
prs.Advance();
if (prs.ReadInt(out rz._ix))
{
if (ch == 'L')
{
evaluator = rz.GetLeft;
}
else
{
evaluator = rz.GetRight;
}
return(true);
}
else
{
rz._error = string.Format("Error in formaula \"{0}\": must be integer after 'N{1}'", formula, ch);
return(false);
}
}
else if (Char.IsDigit(ch)) // N10-20 format
{
int rx;
if (prs.ReadInt(out rz._ix) &&
prs.ReadChar(out ch) && (ch == '-') &&
prs.ReadInt(out rx))
{
if (Char.ToLower(prs.NextChar) == 't') // N10-3T (Trim right form)
{
rz._tr = rx;
evaluator = rz.GetSubT;
}
else
{
rz._len = rx - rz._ix + 1;
if (rz._len <= 0)
{
rz._error = string.Format("Error in formaula \"{0}\": bad requested substring length {1}. Must look like 'N10-20' to get substring from position 10 to 20", formula, rz._len);
return(false);
}
evaluator = rz.GetSub;
}
return(true);
}
else
{
rz._error = string.Format("Error in formaula \"{0}\": must look like 'N10-20' to get substring from position 10 to 20", formula);
return(false);
}
}
rz._error = string.Format("Error in formaula \"{0}\". Must be in form: 'N'|'NLnn'|'NRnn'|'Nnn-nn' where 'nn' is integer", formula);
return(false);
}
catch (Exception x) {
rz._error = string.Format("Error in formaula \"{0}\". {1}: {2}", formula, x.GetType().Name, x.Message);
return(false);
}
}
